CWEA LAB ANALYST COMPLETE SET Questions and Correct Solutions 2024

CWEA LAB ANALYST COMPLETE SET Questions and Correct Solutions 2024 An amperometric titration is often used when measuring - Answer -Residual chlorine The most important reason for chlorinating effluent is - Answer -Disinfection Chlorination serves primarily to destroy or deactivate disease-producing microorganisms When wastewater samples are chlorinated and the pH is lowered - Answer -HCLO is formed Hypochlorous acid Which of the following constituents is the best disinfecting agent? - Answer -HClO What is most likely to interfere with the DPD test? - Answer -Oxidized manganese How is N, N-diethyl-p-phenylenediamine more commonly represented? - Answer -DPD The chlorine residual may be determined using the reagent - Answer -DPD The quantity of chlorine that is converted to inert or less active forms of chlorine by substances in wastewater - Answer -Total combined chlorine Before you perform an amperometric titration for total residual chlornie, what two solutions should be added to the sample? - Answer -Kl and acetate buffer (Potassium iodide) When performing an amperometric titration for chlorine, how many milliliters of sample should be analyzed? - Answer -200 mL When using a spectrophotometer to measure chlorine, what wave length of light should be used? - Answer -515 nm An effluent with a high level of ammonia nitrogen has chlorine residual that is mostly - Answer - Combined chlorine The mercuric nitrate titration technique for measuring chloride is falling into disuse in the laboratory because the: - Answer -technique is lengthy and requires highly skilled instrument technicians to accurately analyze the samples.Standard phenylarsine oxide solution (PAO): - Answer -should be handled with caution because it is a severe poison. Sample Protocol for chloride includes - Answer -glass or plastic container with no preservative Flow proportional sample. If total sample volume is 1 liter - Answer -100ml The incubator for the BOD determination should be monitored and r